饱和软土中模袋围堰变形规律现场试验研究  

Field Test on the Deformation Law of Geomembrane Bag Cofferdam in Saturated Soft Soil

作　　者：李明宇[1] 李成强 刘涛[3] 张艳伟[1] 

机构地区：[1]郑州大学土木工程学院,郑州讲师450001 [2]中铁工程设计咨询集团有限公司交通分院,郑州450000 [3]中国海洋大学,青岛266100

出　　处：《城市轨道交通研究》2015年第9期110-114,130,共6页Urban Mass Transit

基　　金：国家自然科学基金项目(50978235)

摘　　要：以横琴海底专用隧道工程为背景,介绍了海上明挖隧道工程中围堰设计与施工方法,并对饱和软土中模袋砂围堰变形规律进行了探讨。研究表明:在围堰加载过程中和完成之初,堰体侧移和沉降变形增幅较快,此后随着软弱下卧层土中超孔隙水压力的消散,堰体变形增幅逐渐减小;施工加载对约3倍围堰高度范围内下卧层土中超孔隙水压力变化规律影响较大;季节降雨对堰体侧移影响较大,对堰体沉降影响较小;工程中潮汐和基坑降水对围堰变形影响较小。Having Hengqin undersea tunnel project as the background, the design method and key construction tech- nologies of the geomembrane bag cofferdam in the open-cut sea tunnel engineering are introduced, the deformation law of the cofferdam is analyzed. Research shows that the deep horizontal displacement and the settlement of the coffer- dam increasedfast in both the process and the initial com- pletion phase of loading. As the excess pore water pressure gradually dissipates in the soft-substratum soil, the coffer- dam deformation rate decreasedgradually. In the range of three-time cofferdam height, the dissipation rule of the ex- cess pore water pressure is affected greatly by the construc- tion loading. Besides, impact of seasonal rainfall on the deep horizontal displacement of the cofferdam is bigger and but smaller on the settlement of the cofferdam. In addi- tion,tide and foundation pit dewatering have little impact on the cofferdam deformation in this project.

关 键 词：饱和软土 模袋围堰 变形规律 现场试验 

分 类 号：U455.4[建筑科学—桥梁与隧道工程] U459.5[交通运输工程—道路与铁道工程]